2731-00-2Relevant articles and documents
Exploiting the chiral ligands of bis(Imidazolinyl)-and bis(oxazolinyl)thiophenes—Synthesis and application in Cu-catalyzed friedel–crafts asymmetric alkylation
Al-Majid, Abdullah Mohammed,Alammari, Abdullah Saleh,Alshahrani, Saeed,Barakat, Assem,Haukka, Matti,Islam, Mohammad Shahidul
, (2021/12/17)
Five new C2-symmetric chiral ligands of 2,5-bis(imidazolinyl)thiophene (L1–L3) and 2,5-bis(oxazolinyl)thiophene (L4 and L5) were synthesized from thiophene-2,5-dicarboxylic acid (1) with enantiopure amino alcohols (4a–c) in excellent optical purity and chemical yield. The util-ity of these new chiral ligands for Friedel–Crafts asymmetric alkylation was explored. Subse-quently, the optimized tridentate ligand L5 and Cu(OTf)2 catalyst (15 mol%) in toluene for 48 h promoted Friedel–Crafts asymmetric alkylation in moderate to good yields (up to 76%) and with good enantioselectivity (up to 81% ee). The bis(oxazolinyl)thiophene ligands were more potent than bis(imidazolinyl)thiophene analogues for the asymmetric induction of the Friedel–Crafts asymmetric alkylation.
Visible-Light-Induced Trifluoromethylation of Isonitrile-Substituted Indole Derivatives: Access to 1-(Trifluoromethyl)-4,9-dihydro-3H-pyrido[3,4-b]indole and β-Carboline Derivatives
Liu, Jiaxin,Li, Longhai,Yu, Liuzhu,Tang, Lisha,Chen, Qin,Shi, Min
supporting information, p. 2959 - 2965 (2018/08/17)
A visible-light-induced trifluoromethylation of isonitrile-substituted indole derivatives has been developed from the reaction of isonitrile-substituted indoles with Togni II reagent, affording 1-(trifluoromethyl)-4,9-dihydro-3H-pyrido[3,4-b]indoles in mo
Organocatalytic enantioselective synthesis of C3 functionalized indole derivatives
Kaur, Jasneet,Islam, Nasarul,Kumar, Akshay,Bhardwaj, Vimal K.,Chimni, Swapandeep Singh
, p. 8042 - 8049 (2016/11/22)
A highly enantioselective Michael addition reaction of indolylnitroalkenes with 1,3-dicarbonyl compounds has been developed to obtain enantiomerically enriched 3-(2-nitro-1-(1-tosyl-1H-indol-3-yl)ethyl)pentane-2,4-dione derivatives in up to 98% ee using BnCPN as an organocatalyst. The transition state structure has been predicted using DFT calculation.